Adjustable horse halter



FIG. 1 is a side (either) elevational view of the novel adjustable horse halter;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a perspective view of the novel adjustable horse halter in position on a horse.

The broken lines are for purposes of illustration only and form no part of the claimed design. 

The ornamental design for an adjustable horse halter, as shown and described. 